Allen-Bradley 1756-BA1 ControlLogix & FlexLogix Battery | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-BA1 is a 3V lithium battery designed for use in Rockwell Automation ControlLogix and FlexLogix programmable logic controller (PLC) systems. It provides backup power to retain program memory and real-time clock data during power outages or planned shutdowns, making it a critical consumable component in any ControlLogix-based control architecture.
Whether you are sourcing a 1756-BA1 replacement, evaluating a functionally equivalent battery, or comparing cross-brand substitutes for your maintenance inventory, this guide provides the technical detail and selection criteria you need to make a confident procurement decision.
Technical Specifications
- Part Number: 1756-BA1
- Manufacturer: Allen-Bradley / Rockwell Automation
- Chemistry: Lithium (Li/SOCl₂)
- Nominal Voltage: 3V DC ⚡ (critical for replacement matching)
- Capacity: 1200 mAh ⚡ (key parameter for service life equivalence)
- Operating Temperature: 0°C to +60°C
- Storage Temperature: -40°C to +85°C
- Connector Type: 2-pin JST-style plug ⚡ (must match for drop-in replacement)
- Dimensions: Standard 1/2 AA form factor
- Compatible Platforms: ControlLogix (1756 series), FlexLogix (1794 series)
- Certifications: UL, CE, RoHS
- Typical Service Life: 3–5 years (load-dependent)
- Low Battery Warning: Triggered via RSLogix 5000 / Studio 5000 diagnostics
Compatible Replacement & Equivalent Models
1. Direct Drop-in Replacements — Same voltage, capacity, connector, and form factor. No configuration change required.
- 1756-BA1 (OEM, current production) — Primary recommendation
- 1756-BA1/A, /B, /C — Revision variants; fully interchangeable
2. Functional Equivalents — Same electrical specifications; connector or housing may differ slightly. Verify physical fit before installation.
- Tadiran TL-5902 — 3.6V / 1200 mAh lithium thionyl chloride; widely used as functional equivalent. Note: Verify connector pinout before use.
- Saft LS14250 — 3.6V / 1200 mAh; 1/2 AA form factor. Note: May require adapter harness.
- Panasonic BR-1/2AA — 3V lithium carbon monofluoride; lower self-discharge. Note: Confirm capacity meets your backup duration requirement.
3. Cross-Brand Alternatives — Used in multi-vendor environments or when OEM stock is unavailable. Requires engineering review before deployment.
- Siemens 6ES7 971-0BA00 — Siemens S7-300 battery; similar chemistry but different connector. Not a direct substitute — adapter required.
- Mitsubishi Q6BAT — Q-series PLC battery; 3.6V / 1800 mAh. Cross-brand use requires custom wiring harness.
- Always validate voltage, capacity, connector type, and operating temperature range before deploying any cross-brand alternative in a live system.
Why Choose the Original 1756-BA1
- ✅ Precision-matched capacity: Factory-calibrated 1200 mAh ensures accurate low-battery prediction via Studio 5000 diagnostics
- ✅ Certified compatibility: Validated against all 1756 and 1794 chassis revisions by Rockwell Automation
- ✅ Connector integrity: OEM JST plug guarantees secure seating and eliminates intermittent contact risk
- ✅ Regulatory compliance: UL/CE/RoHS certified; meets IEC 60086 lithium battery safety standards
- ✅ Warranty coverage: Use of OEM battery preserves Rockwell Automation system warranty terms
- ✅ Technical support: Full Rockwell TechConnect and Konmask pre-sales support available for OEM parts
Typical Applications
- 🏭 Automotive manufacturing: Body welding lines and paint shop PLC racks requiring uninterrupted memory retention
- ⚡ Power generation: Turbine control systems with extended planned outage intervals
- 🛢️ Oil & gas: Offshore platform safety instrumented systems (SIS) with strict battery change-out schedules
- 💊 Pharmaceutical: FDA-regulated batch process controllers where data integrity is mandatory
- 🚰 Water treatment: Remote SCADA outstations with infrequent maintenance windows
- 🏗️ Mining & metals: Conveyor and crusher control panels in high-vibration environments
System Compatibility
- 1756-L1 / L1M1 / L1M2 / L1M3 — ControlLogix L1 series controllers
- 1756-L55 / L55M12 / L55M16 / L55M24 — ControlLogix L55 series controllers
- 1756-L6x series — ControlLogix L61, L62, L63, L64, L65 controllers
- 1756-L7x series — ControlLogix L71, L72, L73, L74, L75 controllers
- 1794-L34 — FlexLogix controller
- 1756-A4 / A7 / A10 / A13 / A17 — ControlLogix chassis (battery housed in controller module)
- Studio 5000 / RSLogix 5000 — Programming software with integrated battery status monitoring
Selection Guide
Answer these three questions to confirm the 1756-BA1 is the right battery for your system — or to identify the best equivalent:
- What is your controller part number? — Confirm it is a 1756-Lxx or 1794-L34 model. If you have a 1769 (CompactLogix) or 1785 (PLC-5) controller, a different battery part number applies. Contact Konmask for cross-reference.
- What is your required backup duration? — The 1756-BA1 provides approximately 3–5 years of standby backup. If your maintenance interval exceeds this, consider a higher-capacity equivalent or implement a battery monitoring routine in Studio 5000.
- Is this for a live production system or a spare parts inventory? — For live systems, we recommend OEM 1756-BA1 only. For spare parts stock, functional equivalents may be acceptable with engineering sign-off. Contact Konmask to discuss your stocking strategy.
Quality Assurance & Sourcing
Konmask sources the 1756-BA1 exclusively through authorized Rockwell Automation distribution channels and verified OEM-surplus networks. Every unit undergoes a 4-step inspection process before shipment:
- Date code verification — Confirm manufacture date; batteries older than 2 years from production are rejected
- Open-circuit voltage test — Measured at ≥2.95V (fresh cell baseline); units below threshold are quarantined
- Connector and housing inspection — Visual and dimensional check for plug integrity, label legibility, and seal condition
- Packaging integrity check — Anti-static pouch sealed, lot traceability label applied, ESD-safe outer carton
Available documentation upon request: Certificate of Conformance (CoC) · Material Safety Data Sheet (MSDS/SDS) · Country of Origin declaration · Lot traceability records
How to Order
- Confirm your part number — Verify 1756-BA1 against your controller nameplate or Rockwell catalog. Need a cross-reference? Email support@konmask.com.
- Submit your inquiry — Add to cart for standard orders, or contact us directly for volume pricing (10+ units), urgent delivery, or documentation requirements.
- Receive confirmation within 24 hours — Our team will confirm stock availability, lead time, shipping options, and provide a proforma invoice if required.
📞 +0086 19859288691 | ✉️ support@konmask.com
Replacement & Compatibility FAQ
Q1: What battery can replace the Allen-Bradley 1756-BA1?
The most reliable 1756-BA1 replacement is the OEM part itself (current production). For functional equivalents, the Tadiran TL-5902 (3.6V / 1200 mAh) and Saft LS14250 are commonly used substitutes — however, connector compatibility must be verified before installation. Konmask recommends OEM for all live production systems.
Q2: Is the 1756-BA1 compatible with both ControlLogix and FlexLogix controllers?
Yes. The 1756-BA1 is compatible with the full range of 1756-Lxx ControlLogix controllers and the 1794-L34 FlexLogix controller. It is not compatible with CompactLogix (1769 series) or PLC-5 (1785 series) — those platforms use different battery part numbers.
Q3: Can I use a generic lithium battery as an equivalent substitute for the 1756-BA1?
A generic battery may function as a short-term substitute if it matches the 3V nominal voltage, 1200 mAh capacity, and JST connector pinout — but it will not integrate with Studio 5000 battery diagnostics and may void your Rockwell system warranty. For maintenance-critical applications, always use the OEM equivalent or a validated functional replacement sourced from a traceable supply chain.
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Contact: support@konmask.com | +0086 19859288691
